Go Lang find files with extension from the current working directory.

findFilesWithExtension.go

/* Go Lang find files with extension from the current working directory.
Copyright (c) 2010-2014 Alex Niderberg */

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"regexp"
)

func main() {
	fmt.Println(checkExt(".txt"))
}

func checkExt(ext string) []string {
	pathS, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	var files []string
	filepath.Walk(pathS, func(path string, f os.FileInfo, _ error) error {
		if !f.IsDir() {
			r, err := regexp.MatchString(ext, f.Name())
			if err == nil && r {
				files = append(files, f.Name())
			}
		}
		return nil
	})
	return files
}

This is not ideal solution imo... let's assume ext == .txt and filename is filename.txt.bak Then your regexp would still match. I would use filepath.Ext instead of regexp.

if filepath.Ext(path) == ext {
    files = append(files, f.Name())
}

Thank you, It works for me as it is!

yee haw

do note that this ignores the filepath.Walk error and the regexp.MatchString error

Nice thanks!

You can also write regex in the ext variable.
if you have a file with .txt.bak, you can just add a $ to the end. This means that the extension .txt must always be at the end and nothing more may come after it.

func main() {
	fmt.Println(checkExt(".txt$"))
}

Or for a more advanced selection:

# Files in Folder
my_nice.txt
my_second-nice.txt
my_nice.txt.bak
superduper.txt

func main() {
	fmt.Println(checkExt("my_.*.txt$"))
}

Output: [my_nice.txt my_second-nice]